feat: Add support for CURL networking. #2498

Job	Run time
contract-tests	3m 3s
build-test-client-mac	9m 2s
build-test-client-windows	16m 30s
build-test	5m 26s
build-test-client-mac-curl	11m 13s
build-test-client-windows-curl	17m 8s
contract-tests-curl	5m 6s
build-test-curl	5m 48s
	1h 13m 16s

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